Abstract
The modular multilevel inverter circuit structure is introduced, three traditional multi-carrier PWM modulation strategies for modular multilevel inverter circuits are studied and analyzed, and the inverter-side output voltage spectrum is analyzed by simulation. Based on the traditional multi-carrier PWM modulation strategy, this paper uses the PWM technology combining multi-reference wave and multi-carrier to analyze and simulate, and builds a modulation model and a circuit model of the modular multilevel inverter circuit in the Matlab/Simulink environment. Compared with the simulation results of the traditional multi-carrier PWM strategy, the multi-carrier modulation algorithm of the multi-reference wave can slightly reduce the total harmonic distortion rate. At the same time, the multi-carrier modulation algorithm of multiple reference waves can ensure that the capacitor voltage values of each submodule of the modular multilevel inverter circuit are equal so that there is no circulation phenomenon between each phase. Finally, a physical platform is built to verify the authenticity of the simulation experiment.
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